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How to store MySQL date in Javascript array?

I have searched over the Internet, there is a lot of way to store MySQL records into Javascript array though PHP, like this one. However I can't really store the date record in Javascript.
Let say,
My MySQL date record rows in column called holiday_date: 2017-06-25, 2017-06-26, 2017-06-27.
How can I store in Javascript after I converted them into json by
<?php
$sql = "SELECT public_holiday.holiday_date
FROM public_holiday";
$result = mysqli_query($conn, $sql);
$result_array = Array();
while($row = mysqli_fetch_assoc($result))
{
$result_array[] = $row;
}
$json_array = json_encode($result_array);
echo $json_array;
?>
?
I have tried to store them into a javascript date array like
var holidays = [<?php //sample array for example
$loop_one = true;
foreach ($result_array as $date)
{
if ($loop_one)
{
echo "'new Date(\'$date\')'";
$loop_one=false;
}
else
{
echo ", 'new Date(\'$date\')'";
}
}
?>];
but all of these are invalid.
I need your help, much appreciated.

To get a javaScript date object array you need to change your script code only no need to change the PHP code.
You can use JSON.parse and forEach loop.
Try like this
<script>
var holidays = '<?php echo $json_array;?>';
holidays=JSON.parse(holidays);
var holidayArray=[];
holidays.forEach(function (key) {
holidayArray.push(new Date(key));
});
console.log(holidays);
console.log(holidayArray);
</script>
It will produce an out put as
I thing it will help you.

So in your sample, the $result_array variable will be a PHP array like:
$result_array = ['2017-06-25', '2017-06-26', '2017-06-27'];
You do not really need to convert this to JSON before passing it to your Javascript. Instead, you could print those string values directly into your Javascript to instantiate the date object, i.e.
<?php
$sql = "SELECT holiday_date FROM public_holiday";
$result = mysqli_query($conn, $sql);
$result_array = Array();
while($row = mysqli_fetch_assoc($result))
{
$result_array[] = $row['holiday_date']; # Return the actual date value and not an array
}
?>
Javascript Part:
var holidays = [<?php
$firstLoop = true;
foreach ($result_array as $date_result) {
# Here you could format your $date_result variable as a specific datetime format if needed to make it compatible with Javascripts Date class.
if ($firstLoop) {
$firstLoop = false;
echo "new Date('$date_result')";
} else {
echo ", new Date('$date_result')";
}
}
?>];
In this example, I'm constructing a javascript array of new Date($phpDateTime) objects.

Your while loop should be like this and push the date into new array
<?php
$result_array = Array();
while($row = mysqli_fetch_assoc($result))
{
$result_array[] = $row['public_holiday.holiday_dat'];
}
//$result_array contains date like this $result_array = ['2017-06-26', '2017-06-27'];
?>
Javascript example
<script>
var holidays = [<?php $result_array = ['2017-06-26', '2017-06-27']; //sample array for example
$loop_one = true;
foreach ($result_array as $date) {
if ($loop_one) {
echo "'new Date(\'$date\')'";
$loop_one=false;
} else {
echo ", 'new Date(\'$date\')'";
}
}
?>];
console.log(holidays);
</script>
Update 1: Finally your code should be like this
<?php
$sql = "SELECT public_holiday.holiday_date FROM public_holiday";
$result = mysqli_query($conn, $sql);
$result_array = Array();
while($row = mysqli_fetch_assoc($result))
{
$result_array[] = $row['public_holiday.holiday_dat'];
}
?>
<script>
var holidays = [<?php
$loop_one = true;
foreach ($result_array as $date) {
if ($loop_one) {
echo "'new Date(\'$date\')'";
$loop_one=false;
} else {
echo ", 'new Date(\'$date\')'";
}
}
?>];
console.log(holidays);
</script>

for loop to set javascript variable = to a php variable

I am working on a project that requires create hundreds of variables in javascript with PHP values. I can write each one line by line like so:
var M1 = <?php echo json_encode($$mn[0]); ?>;
var M2 = <?php echo json_encode($$mn[1]); ?>;
var M3 = <?php echo json_encode($$mn[2]); ?>;
As I said there are hundreds of these though and if it is possible to do in a loop I would be very interested in learning. I have searched all over and can't find a direct answer. It may very well be that this is not possible. I am new to coding and still learning what certain code can and cannot do.
Any insight or direction on this topic would be greatly appreciated!
If this is not an option is it possible to use an array index for the javascript variable name? I have created an array for the JS and PHP. The PHP works fine above but if I try to use an array index for the JS like below, it breaks:
var mcirc[0] = <?php echo json_encode($$mn[0]); ?>;
I have output the array and the values are coming up correctly but when I run this I get the message:
[object HTMLDivElement]
instead of the actually value that should show up.
UPDATE
$mn array:
for ($m1 = 1; $m1 < 6; $m1++) {
$mn[] = 'M'.$m1;
}
UPDATE
Select SQL creating array:
$sqlMC = "SELECT * FROM tblmaincircles";
$result = $conn->query($sqlMC);
while($row = $result->fetch_assoc()) {
$$row["mcID"]= $row["mcName"];
}
The array for mcID looks like this:
M1 = "text1"
M2 = "text2"
M3 = "text3"
M4 = "text4"
M5 = "text5"
UPDATE
end result desired:
var M1 = "text1";
var M2 = "text2";
var M3 = "text3";
var M4 = "text4";
var M5 = "text5";
Where "text1, ...2, ...3, ...4, ...5" are coming from the MySQL database.
UPDATE
Here is the final code that got this working:
$sqlMC = "SELECT mcID, mcName FROM tblmaincircles";
$result = $conn->query($sqlMC);
while($row = $result->fetch_assoc()) {
$mcID[] = $row["mcID"];
$mcName[] = $row["mcName"];
}
<?php for ($m1 = 0; $m1 <5; $m1++) { ?>
var <?php echo $mcID[$m1]; ?> = <?php echo json_encode($mcName[$m1]); ?>;
<?php } ?>

Simply put JSON into variable
var json = <?php echo json_encode($$mn); ?>;
And then process the JSON way you want:
eg.
var json=[{key:someValue},
{key:someValue2},
{key:someValue3}
];
json.forEach(function(a){
console.log(a.key);
})

First in your query part, declare a variable to hold the result that you want. I'm assuming the M1 is mcID in your table and text1 is the mcName. For example:
$sqlMC = "SELECT * FROM tblmaincircles";
$result = $conn->query($sqlMC);
$mac = [];//or $mac = array(); Depends on your PHP version.
while($row = $result->fetch_assoc()) {
$mac[$row["mcID"]] = $row["mcName"];
}
And then, iterate through the $mac array with foreach loop. I'm assuming you are using PHP codes within HTML. The $key will be the mcID and the $value will be the mcName.
//php tag for the foreach opening
<?php foreach ($mac as $key => $value) { ?>
var <?php echo $key; ?> = <?php echo "'$value';"; ?>
//php tag for the foreach closing
<?php } ?>
OR, if you want to use javascript associative array.
var macJs = {};
<?php foreach ($mac as $key => $value) { ?>
macJs.<?php echo $key; ?> = <?php echo "'$value';"; ?>
<?php } ?>
And you can access the element like this in javascript macJs.M1.

You should use JSON to 'export' your objects/array through different languages, in that case:
var json = '<?= json_encode($your_array); ?>';
After this you can parse this Json, what should return your array:
var your_array = JSON.parse(json);

PHP JSON into javascript variable

befora I ask this i tried every solution on google and here on stackoverflow.
So in my js file I have this
var locations = [
['Name','Country','City','lat','lng'],
['Name','Country','City','lat','lng'],
];
When i wrote this in file manually my mapp shown locations but I need to generate content of locations variable from mysql in php, is there something that I missing.I tried with ajax,console.log...etc
My PHP file
$result = mysqli_query($link, "SELECT hospital_name,country,city,lat,lng FROM hospitals");
$to_encode = array();
while($row = mysqli_fetch_row($result)) {
$to_encode[] = $row;
}
echo json_encode($to_encode);
I tried this but no success
$.getJSON( "process.php", function( json ) {
var locations = json;
});

I just switched your mysqli_fetch_row to mysqli_fetch_array
$result = mysqli_query($link, "SELECT hospital_name,country,city,lat,lng FROM hospitals");
$to_encode = array();
while($row = mysqli_fetch_array($result)) {
$to_encode[] = $row;
}
echo json_encode($to_encode);

Change the value of external Javascript with PHP in foreach loop

How can I change the value of a js variable in a PHP foreach loop?
The js needs to be external.
This is a piece of the index.php here I want to get the output $prozent in the javascript, I don't know how to get a PHP variable to execute a js every time in a loop, the js is a chart. I get the chart in the loop in the echo'<div class="chart-wrapper"> with a this chart js.
<?php
$sql = //SQL query
$res = mysql_query($sql);
$i = 0;
$survey = array();
while ($row = mysql_fetch_assoc($res)) {
$survey[$i]['label'] = $row['Label'];
$i++;
}
foreach ($survey as $survey) {
echo '<div class="col-md-4">';
echo '<div class="front face">';
echo "<h3> ".$survey['label']."<br>";
$sql = //SQL Query
$res = mysql_query($sql) ;
$sql = //SQL Query
$resSum = mysql_query($sql) ;
while ($row = mysql_fetch_array($resSum)) {
$survey['ausgabe'] = $row['sum(a.answer)'];
}
$anzahlreihen = mysql_num_rows($res);
if ($anzahlreihen > 0) {
$prozent = $anzahlreihen * $survey['ausgabe'];
//bunch of ifelse statements
//This is the variable i want to get in the js
echo (round( $prozent, 2));
echo '</font>';
}
}
echo '</div>';
echo '<div class="back face center">';
echo'<div class="chart-wrapper">
}

There are two ways PHP and Javascript can interact.
Use AJAX to request a PHP script which returns JSON or have PHP output the following example HTML;
<script type="text/javascript">
var variable = value;
</script>

Javascript cant get value from PHP variable?

I want make data exist checker.
data.check.php:
<?php
$nick = mysql_real_escape_string($_POST['nick']);
$query = mysql_query("select * from tb_user WHERE nick='$nick'");
$nick_exist = mysql_num_rows($query);
?>
<script language="javascript" type="text/javascript">
var nick_exist = "<?php echo $nick_exist; ?>";
</script>
and this for $POST data
input.data.js
var v_nick = $('input:text[name=nick]').val();
$.post('data.check.php', {nick: v_nick} ,function() {
if(nick_exist){
window.alert('Choose another nick please!');
}
});
I dont know where is the problem and my windows.alert is not running :(
thanks u

try like this get the count in php then return it to js:
NOTE: Please do not use mysql it is deprecated now start using mysqli or pdo.
data.check.php:
<?php
$nick = mysql_real_escape_string($_POST['nick']);
$query = mysql_query("select * from tb_user WHERE nick='$nick'");
$nick_exist = mysql_num_rows($query);
echo json_encode(array('count'=> $nick_exist));//send result to javascript
?>
input.data.js
var v_nick = $('input:text[name=nick]').val();
$.post('data.check.php', {nick: v_nick} ,function(resp) {
var resp=JSON.parse(resp);
if(resp.count){
window.alert('Choose another nick please!');
}
});